Control structure and control method for switching electric control to hydraulic control for electric control master pump of excavator

Abstract

The invention discloses a control structure for switching electric control to hydraulic control for a master pump of an excavator. The control structure comprises a master pump electric control structure and a master pump hydraulic control structure, and the master pump electric control structure and the master pump hydraulic control structure are mutually switched through an alternate control valve set. The control structure has the advantages that adoption of a reversing valve, an electromagnetic proportional valve and a control switch to switch electric control and hydraulic control guarantees low cost and operational simplicity and convenience, failure causes can be quickly judged for the excavator, and accordingly a troubleshooting range is narrowed, failure is treated purposefully, and timeliness of failure treatment is guaranteed; when an electric system or controller fails, the excavator can be maintained to operate by hydraulic control, and accordingly delaying of construction period is avoided for customers, time wasted on waiting for repair is shortened, and the efficiency of the excavator is improved to a certain degree; and when the excavator is unable to operate or travel due to failure of the electric system or controller, the exactor can be guaranteed to escape the dangerous zone to avoid damage.

Description

technical field [0001] The invention relates to a control structure of a main pump of an excavator, in particular to a control structure and a control method for switching an electric control main pump of an excavator to a hydraulic control. Background technique [0002] Excavator, also known as excavating machinery (excavating machinery), is an earth-moving machine that uses a bucket to dig materials higher or lower than the bearing surface, and loads them into transport vehicles or unloads them to the stockyard. [0003] With the expansion of construction demand, the scope of use of excavators is becoming wider and wider. Excavators play a pivotal role in mineral development, water conservancy construction, and road construction. The aspect is more picky and puts forward higher requirements. In order to make the excavator more efficient, energy-saving and have good responsiveness and operability, the performance of the hydraulic system of the excavator is continuously imp...

AI Technical Summary

Problems solved by technology

[0004] Existing excavators generally use negative feedback control hydraulic systems, which have disadvantages such as poor responsiveness and large median pressure loss compared with positive feedback systems. At the same time, the power matching of negative feedback control hydraulic systems is basically limited by the structure of the main pump regulator. , unable to give full play to the potential of the engine, maximize the efficiency of the excavator and reduce fuel consumption

Later, the more advanced positive feedback electronically controlled hydraulic system excavator was withdrawn, and some progress was made in improving efficiency and reducing fuel consumption. Since the excavator unit is completely electronically controlled, it cannot be switched to hydraulic control. When the excavator fails, it is difficult for the service personnel to quickly judge whether the cause of the fault is the electrical or hydraulic system, which affects the timeliness of the excavator's fault handling; and When the electrical system or the controller unit fails, the hydraulic system will not work normally, resulting in the inability of the whole machine to be constructed and affecting the customer's construction period. Moving the excavator, causing the excavator to face damage

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